Stent occlusion on Punctured stent 6 months after follow-up, stent patency After stent implantation of lower limb artery stent, because of stent fracture, failure to take medication according to the doctor’s requirement, or poor control of the underlying lesion, which leads to intra-stent thrombosis, excessive proliferation of intima and smooth muscle cells, and intra-stent occlusion. The first peak of intra-stent blockage is 3-6 months after stent implantation, and the second peak is about one year after stent implantation. What should I do if the stent is blocked? 1) If it is discovered by the patient during routine review as requested by the doctor and he/she does not feel abnormal, it means that there is abundant collateral circulation established and can be listened to without further treatment. 2) If the original ischemic symptoms recur and worsen within a short period of time, it indicates a high possibility of blockage caused by acute thrombosis in the stent (ultrasound can help determine whether it is an acute thrombosis). Recanalization of the stent can be achieved by either medication or mechanical thrombolysis. (3) If the ischemic symptoms appear slowly for 6 months or longer after stent implantation and progressively worsen, it is often an overproliferation of intimal and smooth muscle cells with chronic thrombosis causing blockage in the stent, which requires another intervention (see above), which requires certain techniques and skills. After stent recanalization, the use of drug-coated balloon dilation, or implantation of a drug-coated stent, can prevent or delay restenosis and blockage of the stent. Of course, vascular bypass is also an effective approach, weighing the general condition of the patient (including the functional status of the heart, lungs, kidneys, and other organs) and the availability of an ideal vascular graft (usually a saphenous vein).